Now, if I press the assigned keyboard shortcut, small (I would say primitive) window of GoldenDict opens.
I would prefer the main window of GoldenDict covering the whole screen to open.
Now I solve this issue by turning off translation by keyboard shortcut and assigning the keyboard shortcut to open the main window. So, I select a word, press the keyboard shortcut, the main window opens, then I click Ctrl+V to insert the copied word into entry bar and press Enter. But it's too long.
I would prefer to select a word, press the keyboard shortcut and see translation in the main window opened (as in ABBYY Lingvo).